Diplomacy
	Heraldry (Herald)
	Trade Contacts
		Scouting Program (Scout)
		Trade Stations (Trade Route)
			Open Borders (Immigration)
Bridge Building
	Engineering (Siege Defense, Public Works)
		Coastal Alarm System (Coastal Watch Tower)
		Warships (Franks Warship)
		Public Works (Public Works)
			Trade Stations (Trade Route)
				Open Borders (Immigration)
			Grape Planting/Refrigeration (Vinyard)
			Woodcrafting (Lumber Yard)
				Workhorses (Workhorse)
				Siege Towers (Siege Tower)
			Organized Labor (Manor House)
				Workhorses (Workhorse)
				Skilled Labor (Skilled Labor)
		Stoneworking Art (Gargoyles)
Mathematics
	Calendar Reform
		Woodcrafting (Lumber Yard)
			Siege Towers (Siege Tower)
Civil Law
	Heraldry
		Trade Contacts
			Trade Stations (Trade Route)
				Open Borders (Immigration)
	Capitulary Reform (capitulary)
		Organized Labor (Manor House)
			Workhorses (Workhorse)
			Skilled Labor (Skilled Labor)
	Popular Support (Guerilla Warfare)
		Calendar Reform
		Capitulary Reform
			Open Borders (Immigration)
Castle Building/Construction (castle tile imp)
	Engineering (Moat, Public Works)
		Coastal Alarm System (Coastal Watch Tower)
		Warships (Franks Warship)
		Public Works (Public Works)
			Grape Planting/Refrigeration (Vinyard)
			Woodcrafting (Lumber Yard)
				Workhorses (Workhorse)
				Siege Towers (Siege Tower)
			Trade Stations (Trade Route)
				Open Borders (Immigration)
			Organized Labor (Manor House)
				Workhorses (Workhorse)
				Skilled Labor (Skilled Labor)
		Stoneworking Art (Gargoyles)
Christianity (Church)
	Popes Blessing (Gregorian Chants)
		Stoneworking Art (Gargoyles)
	Popular Support (Guerilla Warfare)
		Calendar Reform
		Capitulary Reform (capitulary)
			Organized Labor (Manor House)
				Skilled Labor (Skilled Labor)
			Open Borders (Immigration)
Military Organization (Army Camp)
	Coastal Alarm System (Coastal Watch Tower)
	Warships (Unique Frank Warship)
	Siege Towers (Siege Tower)
	Scouting Program (Scout)
		Skilled Labor (Skilled Labor)
Agriculture (Farmer Unit)
	Cash Crops (Cash Crops)
		Grape Planting/Refrigeration (Vinyard)
Economy 
	Trade Contacts 
		Scouting Program (Scout)
			Skilled Labor (Skilled Labor)
		Trade Stations (Trade Route)
			Open Borders (Immigration)
	Cash Crops (Cash Crops)
		Grape Planting/Refrigeration (Vinyard)